diff --git a/src/_zkapauthorizer/tests/test_model.py b/src/_zkapauthorizer/tests/test_model.py
index 93c91886909c44d4c4c73756d62baf3007775eb3..d758e1ffa2c81f4d0d7f5da841f6b58b7a8c7ad8 100644
--- a/src/_zkapauthorizer/tests/test_model.py
+++ b/src/_zkapauthorizer/tests/test_model.py
@@ -590,6 +590,9 @@ def random_slice(taken_from, random, data):
 
 
 class UnblindedTokenStateTests(TestCase):
+    """
+    Glue ``UnblindedTokenStateTests`` into our test runner.
+    """
     def test_states(self):
         run_state_machine_as_test(lambda: UnblindedTokenStateMachine(self))